If the config file has deprecated features (perhaps because you've
upgraded the buildmaster and need to update the config file to match),
they will be announced by checkconfig. In this case, the config file
will work, but you should really remove the deprecated items and use
the recommended replacements instead:

% buildbot checkconfig master.cfg
/usr/lib/python2.4/site-packages/buildbot/master.py:559: DeprecationWarning: c['sources'] is
deprecated as of 0.7.6 and will be removed by 0.8.0 . Please use c['change_source'] instead.
warnings.warn(m, DeprecationWarning)
Config file is good!